They seem to have ditched the box-wing design for the more conventional large-wingspan HALE concept.

Another change is the switch from a large engine for two smaller turbo-jets or turbo-fans, its difficult to definitively say which.

This change is probably due to the need for higher thrust to produce a high altitude, high speed design like the Global Hawk or its naval cousin. Chinese aero-engine industry deficiencies in the small turbo-fan department are probably the cause for the twin engine decision.
That and the reduced, more manageable IR signature of smaller engines.

2. Xianglong/ Soar Dragon's maiden flight won't take place in Chengdu...and Skywing is much smaller than Soar Dragone..

length:8.9m vs 14.3m
wingspan: 18.8 vs 25m

we thought the competitive solutions of Xianglong/Soar Dragon used to be the "Long Eagle" project from the BUAA ( Beijing University of Aeronautics and Astronautics ) with the similar size but Skywing alike layout...

I might have mistaken it for something else then. Or got confused between different variants appearing every now and then under different name.

Click to expand...

SkyWing is the name for a serial of UAV projects from AVIC. group...

Skywing-1 is a civilian model and displayed frequently...Skywing 5 is a rotor wing UAV

Skywing-3 might be chosen by PLAAF already ,so it disappeared from any public occasions...we haven't seen its show on any expo for years. so I was a little surprised to hear your claim about its appearance in Paris last year...

2. Xianglong/ Soar Dragon's maiden flight won't take place in Chengdu...and Skywing is much smaller than Soar Dragone..

length:8.9m vs 14.3m
wingspan: 18.8 vs 25m

we thought the competitive solutions of Xianglong/Soar Dragon used to be the "Long Eagle" project from the BUAA ( Beijing University of Aeronautics and Astronautics ) with the similar size but Skywing alike layout...

Click to expand...

We agree. Soar Dragon is much larger and will carry a larger surveillance payload, which adds credence to the addition of winglets.